JP2008065873A - Optical recording medium, optical recording device, optical recording system, discrimination method, recording method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To record a content ciphered by a CSS (content scramble system) ciphering system in an optical recording medium for recording in a reproducible state. <P>SOLUTION: When discrimination information, indicating that only the contents ciphered by a CSS ciphering system is a recordable content, is stored in an optical disk, contents is recorded in a data region of the optical disk, and key information is recorded in a lead-in region of the optical disk (S405, S409). Meanwhile, when discrimination information is not stored and meandering of a track of the optical disk has no meandering part that deviates from the DVD+R standards, the optical disk is ejected (S423). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical recording medium, an optical recording apparatus, an optical recording system, a discrimination method, a recording method, and a program, and more specifically, an optical recording medium suitable for recording content encrypted by the CSS encryption method, Discrimination for discriminating whether or not an optical recording apparatus using the optical recording medium as a target medium, an optical recording system including the optical recording apparatus, and the optical recording medium supports recording of content encrypted by the CSS encryption method The present invention relates to a method, a recording method for recording content encrypted by a CSS encryption method and key information thereof on an optical recording medium, and a program used in the optical recording apparatus.

  Video content such as a movie is encrypted by an encryption system called CSS (Content Scramble System), recorded together with key information on a DVD-ROM (digital versatile disc-ROM), and is commercially available. Then, a playback apparatus for playing back video content releases the scrambling of the video content based on the key information recorded on the DVD-ROM (see, for example, Patent Document 1). In this way, the copyright of the video content is protected. The key information is stored in a specific area provided on the inner periphery side of the DVD-ROM.

  Currently, the key information cannot be recorded on a commercially available DVD for recording. For example, in a DVD-based optical recording medium such as DVD-R (DVD-recordable) or DVD-RW (DVD-rewritable), an area corresponding to the specific area of the DVD-ROM is embossed. Further, in DVD + optical discs (hereinafter also referred to as “DVD + R / RW” for convenience) such as DVD + R (DVD + recordable) and DVD + RW (DVD + rewritable), an area corresponding to the specific area of the DVD-ROM is a recording device and a recording system. Is an area where writing is not possible (see, for example, Non-Patent Document 1 and Non-Patent Document 2).

Japanese Patent Laid-Open No. 11-176090 Standard ECMA-349 "Data Interchange on 120mm and 80mm Optical Disc using + R Format-Capacity: 4.7 and 1.46 Gbytes per Side" 1st Edition-December 2003 Standard ECMA-337 "Data Interchange on 120mm and 80mm Optical Disk using + RW Format-Capacity: 4.7 and 1.46 Gbytes per Side" 2nd Edition-December 200

  By the way, in recent years, with the spread of the Internet, it has been considered to download the video content via the Internet as one of the purchase forms of the video content. However, as described above, even with a recording DVD, key information cannot be recorded in a predetermined area, so that the downloaded encrypted video content cannot be recorded on the DVD in a reproducible state. .

  The present invention has been made under such circumstances, and a first object thereof is to provide an optical recording medium for recording capable of recording content encrypted by the CSS encryption method in a reproducible state. There is to do.

  A second object of the present invention is to provide an optical recording apparatus and an optical recording system suitable for recording content encrypted by the CSS encryption method in a reproducible state.

  A third object of the present invention is to provide a determination method capable of easily determining whether or not an optical recording medium is compatible with content recording encrypted by the CSS encryption method. .

  A fourth object of the present invention is to provide a recording method for recording content encrypted by the CSS encryption method on the optical recording medium of the present invention for recording in a reproducible state.

  A fifth object of the present invention is executed by a control computer of an optical recording apparatus and recorded on the optical recording medium of the present invention for recording in a state where content encrypted by the CSS encryption method can be reproduced. It is to provide a program that can do.

  According to the first aspect of the present invention, in a recording optical recording medium having a recording area including a management information area and a data area, a spiral encryption or concentric track is formed. The optical recording medium is characterized in that the key information of the content encrypted by the method can be recorded, and the content that can be recorded in the data area is only the content encrypted by the CSS encryption method.

  According to this, the key information of the content encrypted by the CSS encryption method can be recorded in the management information area, and only the content encrypted by the CSS encryption method can be recorded in the data area. Therefore, as a result, it is possible to record the content encrypted by the CSS encryption method in a reproducible state.

  According to a second aspect of the present invention, there is provided an optical recording apparatus having the optical recording medium of the present invention as a target medium, wherein the recordable content is only content encrypted by the CSS encryption method. First determination means for determining whether or not information is recorded on the optical recording medium; and as a result of determination by the first determination means, when the determination information is recorded on the optical recording medium, A recording means for recording the content encrypted by the CSS encryption method and its key information in the data area and the management information area of the optical recording medium; and as a result of determination by the first determination means, the determination information is A second judgment for judging whether or not the meandering of the track of the optical recording medium has a meandering portion deviating from the DVD + R or DVD + RW standard when not recorded on the optical recording medium. And means for discharging the optical recording medium when the meandering of the track of the optical recording medium does not have a meandering portion deviating from the DVD + R or DVD + RW standard as a result of the determination by the second determining means. And an optical recording apparatus.

  According to this, it is determined by the first determination means whether or not the discrimination information is recorded on the optical recording medium. As a result, if the discrimination information is recorded on the optical recording medium, the recording means The content encrypted by the CSS encryption method is recorded in the data area of the optical recording medium, and the key information is recorded in the management information area of the optical recording medium. On the other hand, when the discrimination information is not recorded on the optical recording medium, the second judgment means judges whether or not the meandering of the track of the optical recording medium has a meandering portion that deviates from the DVD + R or DVD + RW standard. As a result, when the meandering of the track of the optical recording medium does not have a meandering portion deviating from the DVD + R or DVD + RW standard, the optical recording medium is ejected by the ejecting means. Therefore, the content encrypted by the CSS encryption method and its key information can be recorded on the optical recording medium of the present invention. As a result, the content encrypted by the CSS encryption method can be recorded on the optical recording medium of the present invention for recording in a reproducible state.

  From a third aspect, the present invention is an optical recording system that uses the optical recording medium of the present invention as a target medium, the optical recording apparatus of the present invention; and via the optical recording apparatus, by a CSS encryption method. And a processing device for recording the encrypted content and the key information thereof in a data area and a management information area of the optical recording medium, respectively.

  According to this, since the optical recording apparatus of the present invention is provided, the content encrypted by the CSS encryption method is recorded in the data area of the optical recording medium of the present invention, and the key information is recorded on the optical recording medium of the present invention. It is possible to record in the management information area. As a result, the content encrypted by the CSS encryption method can be recorded on the optical recording medium of the present invention for recording in a reproducible state.

  From a fourth viewpoint, the present invention is a determination method for determining whether or not an optical recording medium is compatible with recording of content encrypted by the CSS encryption method, and is encrypted by the CSS encryption method. Checking whether or not discrimination information indicating that only the recorded content is recordable content is stored in the optical recording medium; and as a result of the check, the discrimination information is stored in the optical recording medium. A step of determining that the optical recording medium is compatible with recording of content encrypted by the CSS encryption method.

  According to this, it is checked whether or not discrimination information indicating that only content encrypted by the CSS encryption method is recordable content is stored in the optical recording medium, and as a result, the discrimination information is recorded in the optical recording medium. When stored in the medium, it is determined that the optical recording medium supports recording of content encrypted by the CSS encryption method. Therefore, it is possible to easily determine whether or not the optical recording medium supports recording of content encrypted by the CSS encryption method.

  From a fifth aspect, the present invention is a recording method for recording content encrypted by the CSS encryption method and its key information on an optical recording medium, and only the content encrypted by the CSS encryption method is recorded. A step of checking whether or not discrimination information indicating that the content is recordable is stored in the optical recording medium; and if the discrimination information is stored in the optical recording medium as a result of the check, a CSS encryption Recording the content encrypted by the encryption method and the key information thereof in the data area and the management information area of the optical recording medium; respectively, when the determination result shows that the discrimination information is not stored in the optical recording medium In addition, it is determined whether or not the meandering of the track of the optical recording medium has a meandering portion deviating from the DVD + R or DVD + RW standard. And a step of ejecting the optical recording medium when the meandering of the track of the optical recording medium does not have a meandering portion deviating from the DVD + R or DVD + RW standard as a result of the determination. .

  According to this, it is checked whether or not the discrimination information is stored in the optical recording medium. As a result, if the discrimination information is stored in the optical recording medium, the content encrypted by the CSS encryption method Is recorded in the data area of the optical recording medium, and the key information is recorded in the management information area of the optical recording medium. On the other hand, when the discrimination information is not stored in the optical recording medium, it is determined whether or not the meandering of the track of the optical recording medium has a meandering portion that is out of the DVD + R or DVD + RW standard. If the meandering track of the medium does not have a meandering portion that deviates from the DVD + R or DVD + RW standard, the optical recording medium is ejected. Therefore, the content encrypted by the CSS encryption method and its key information can be recorded on the optical recording medium of the present invention. As a result, the content encrypted by the CSS encryption method can be recorded on the optical recording medium of the present invention for recording in a reproducible state.

  From a sixth aspect, the present invention is a program used in an optical recording apparatus that uses the optical recording medium of the present invention as a target medium, and is a content that can record only content encrypted by the CSS encryption method. A procedure for checking whether or not discriminating information indicating that the discriminating information is stored in the optical recording medium; and if the discriminating information is stored in the optical recording medium as a result of the check, the discriminating information is encrypted by a CSS encryption method. Recording the recorded content and its key information in the data area and the management information area of the optical recording medium; respectively, and if the discriminating information is not stored in the optical recording medium as a result of the check, the optical recording A procedure for judging whether the meandering of the track of the medium has a meandering portion deviating from the standard of DVD + R or DVD + RW; A program for causing the control computer of the optical recording apparatus to execute a procedure for ejecting the optical recording medium when the meandering of the track of the optical recording medium does not have a meandering portion deviating from the DVD + R or DVD + RW standard. is there.

  According to this, when the program of the present invention is loaded into a predetermined memory and the head address is set in the program counter, the control computer of the optical recording apparatus determines whether the discrimination information is stored in the optical recording medium. If the determination information is stored in the optical recording medium, the content encrypted by the CSS encryption method is recorded in the data area of the optical recording medium, and the key information is recorded in the optical recording medium. In the management information area. On the other hand, when the discrimination information is not stored in the optical recording medium, it is determined whether or not the meandering of the track of the optical recording medium has a meandering portion that is out of the DVD + R or DVD + RW standard. When the meandering of the track of the medium does not have a meandering portion deviating from the DVD + R or DVD + RW standard, the optical recording medium is ejected. That is, according to the program of the present invention, it is possible to cause the control computer of the optical recording apparatus to execute the recording method according to the present invention. As a result, the content encrypted by the CSS encryption method and the key information thereof are It becomes possible to record on the optical recording medium of the invention. Therefore, it becomes possible to record the content encrypted by the CSS encryption method on the optical recording medium of the present invention for recording in a reproducible state.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 schematically shows a cross-sectional shape of an optical disc 15 as an optical recording medium according to an embodiment of the present invention.

  A groove G as a spiral guide groove is formed in the recording layer M of the optical disk 15 shown in FIG. In general, in an optical disc, when viewed from the incident direction of laser light, a convex portion is called a groove G, and a concave portion is called a land L. Here, the groove G is an information recording track, and data is recorded in the groove G.

  As shown in FIG. 2, for example, the track has a lead-in area, a data area, and a lead-out area from the inner circumference side toward the outer circumference side. It is divided into a plurality of areas including The lead-in area is a management information area in which management information and the like are stored. The data area is an area for storing user data. The lead-out area is an area in which information for indicating the end position of data is stored. In FIG. 2, for convenience, the track is shown in a straight line, the left side of the paper is the inner peripheral side of the optical disc 15, and the right side of the paper is the outer peripheral side of the optical disc 15.

  Also, the track meanders (wobbles) with respect to the center of the track as shown in FIG. 3 as an example. The track pitch is 0.74 μm.

  The meandering shape of the track is determined by the ADIP unit and the carrier wave. Various types of information are included in the ADIP unit. The carrier wave is used to generate a reference clock signal. In this embodiment, a basic unit composed of one ADIP unit and a series of carrier waves is referred to as an information frame. As shown in FIG. 4 as an example, the size of one information frame is 93 wobbles (wobble numbers 0 to 92) when the size of one carrier wave period (also referred to as a wobble period) is 1 wobble. . The wobble numbers 0 to 7 are ADIP units, and the wobble numbers 8 to 92 are carrier parts.

  The ADIP unit is composed of an area with wobble numbers 0 to 3 (hereinafter referred to as “synchronization information part” for convenience) and an area with wobble numbers 4 to 7 (hereinafter referred to as “ADIP information part” for convenience). Each of the information sections is phase-modulated (PSK: Phase Shift Keying).

  In the ADIP information part, 4 wobbles represent 1-bit data. When the bit data is “0”, as shown in FIG. 5A, the front two wobbles have the same phase as the carrier part, and the rear two wobbles have the opposite phase to the carrier part. On the other hand, when the bit data is “1”, as shown in FIG. 5B, the front two wobbles have the opposite phase to the carrier part and the rear two wobbles have the same phase as the carrier part.

  When the ADIP information part in the next information frame is the first bit of the data, the synchronization information part, as shown in FIG. 6 (A), outputs a word sync signal, that is, all four wobbles are opposite in phase to the carrier part. And Further, when bit data is included in the ADIP information part, as shown in FIG. 6B, the bit sync signal, that is, the leading one wobble is set in the opposite phase to the carrier part, and the remaining 3 The wobble is in phase with the carrier part.

  Then, as shown in FIG. 7, one ADIP word is obtained by 52 information frames.

  The ADIP unit in the lead-in area includes physical format information. This physical format information is obtained by changing only byte 16 of the physical format information in the DVD + R standard (see ECMA-349) or the DVD + RW standard (see ECMA-337). That is, as shown in FIG. 8, “01h” is stored in hexadecimal notation with the byte 16 as “content limitation information”. This “01h” means that the content that can be recorded in the data area of the optical disc 15 is only the content encrypted by the CSS encryption method. In the DVD + R standard or the DVD + RW standard (hereinafter collectively referred to as “DVD + R / RW standard” for convenience), the byte 16 of the physical format information is unused and “00h” is set. .

  The ADIP unit in the data area includes address information. Here, the address is set so as to decrease from the inner circumference side to the outer circumference side of the disk. In the DVD + R / RW standard, addresses are set so as to increase from the inner circumference side to the outer circumference side of the disc.

  As described above, the optical disk 15 of the present embodiment is a recording optical disk that conforms to the DVD + R / RW standard except for the byte 16 of the physical format information and the address information of the ADIP unit in the data area.

  As described above, according to the optical disc 15 according to the present embodiment, the “content limitation information” (discrimination information) is stored in the physical format information that defines the meandering shape of the track in the lead-in area. It is possible to record the content encrypted by the encryption method and its key information. As a result, it is possible to record the content encrypted by the CSS encryption method in a reproducible state. The content encrypted by the CSS encryption method is recorded in the data area, and the key information is recorded in the unused area of the lead-in area.

  Further, according to the optical disc 15 according to the present embodiment, the address information of the ADIP unit in the data area is set so that the address decreases from the inner circumference side to the outer circumference side of the disc, and therefore does not correspond to the optical disc 15. In the optical disk apparatus, the disk is judged to be an abnormal disk and repelled. Accordingly, it is possible to prevent content other than content encrypted by the CSS encryption method from being recorded. In other words, the optical disc 15 is a recording-purpose optical disc that is encrypted by the CSS encryption method.

  In the above-described embodiment, the case where the “content limitation information” is stored in the byte 16 of the physical format information has been described. However, the present invention is not limited thereto, and for example, the “content limitation information” is the byte 17 of the physical format information. May be stored. In the DVD + R / RW standard, the byte 17 of the physical format information is an area in which “Disk Application Code” is stored. Therefore, in this case, recording is incompatible with the conventional optical disc apparatus.

  Moreover, although the said embodiment demonstrated the case where the optical disk 15 had one recording layer, it is not limited to this, You may have a some recording layer.

  FIG. 9 shows a schematic configuration of a personal computer (hereinafter also referred to as “personal computer” for convenience) 10 as an optical recording system according to an embodiment of the present invention.

  The personal computer 10 shown in FIG. 9 includes a main control device 92, an optical disk device 20 as a recording device and a playback device, a hard disk device (HDD) 94, an input device 95, a display device 96, a drive interface 97, a network control device 98, and the like. It has.

  The main controller 92 includes a CPU 92a, a ROM 92b, a RAM 92c, and the like. The CPU 92a controls the entire personal computer 10 based on programs stored in the ROM 92b and the RAM 92c, and performs a recording process to be described later.

  The HDD 94 includes a hard disk 94a and a drive device 94b for driving the hard disk 94a. In the hard disk 94a, various programs described in codes decodable by the CPU 92a of the main controller 92 are recorded. The program recorded on the hard disk 94a is loaded into the RAM 92c of the main controller 92 as necessary.

  The display device 96 includes a display unit (not shown) using, for example, a CRT, a liquid crystal display (LCD), a plasma display panel (PDP), and the like, and displays various information instructed from the main control device 92.

  The input device 95 includes at least one input medium (not shown) of, for example, a keyboard, a mouse, a tablet, a light pen, a touch panel, and the like, and notifies the main control device 92 of various information input by the user. Note that information from the input medium may be input in a wireless manner. In addition, an example in which the display device 96 and the input device 95 are integrated includes an LCD with a touch panel.

  The drive interface 97 is a bi-directional interface between the main controller 92, the optical disc apparatus 20, and the HDD 94, such as ATAPI (AT Attachment Packet Interface), SCSI (Small Computer System Interface), and USB (Universal Serial Bus). Complies with standard interface.

  The network control device 98 controls bidirectional communication using a public line. Internet connection is possible via the network control device 98.

  The optical disk device 20 records information on the set optical disk based on an instruction from the main controller 92.

  As shown in FIG. 10 as an example, this optical disc apparatus 20 has a spindle motor 22, an optical pickup device 23 for rotationally driving a set optical disc, and an optical pickup device 23 for driving the optical pickup device 23 in the radial direction of the optical disc. The seek motor 21, laser control circuit 24, encoder 25, drive control circuit 26, reproduction signal processing circuit 28, buffer RAM 34, buffer manager 37, interface 38, flash memory 39, CPU 40 and RAM 41 are provided. Note that the arrows in FIG. 10 indicate the flow of typical signals and information, and do not represent the entire connection relationship of each block. The optical disk device 20 is assumed to correspond to the optical disk 15.

  The optical pickup device 23 is a device for condensing laser light on the recording layer of the optical disc 15 and receiving reflected light from the recording layer. The optical pickup device 23 includes a semiconductor laser that emits a laser beam having a wavelength corresponding to the optical disc 15, an objective lens that condenses the light emitted from the semiconductor laser on the recording layer of the optical disc 15, and a return reflected by the recording layer. A light receiving device that receives light and a drive system (focusing actuator and tracking actuator) (both not shown) for driving the objective lens are included. The light receiver has a plurality of light receiving elements (or light receiving areas), and outputs a signal (photoelectric conversion signal) corresponding to the amount of light received by each light receiving element (or light receiving area) to the reproduction signal processing circuit 28.

  The reproduction signal processing circuit 28, based on the output signal (a plurality of photoelectric conversion signals) of the light receiver, in the same manner as in the prior art, servo signal (focus error signal, track error signal, etc.), wobble signal, and RF signal (For example, refer to Japanese Patent Laid-Open No. 10-69646). The servo signal obtained here is output to the drive control circuit 26 and the CPU 40. Further, the reproduction signal processing circuit 28 acquires synchronization information, physical format information, address information, and the like from the wobble signal. The synchronization information obtained here is output to the encoder 25, the drive control circuit 26, etc., and the physical format information and address information are output to the CPU 40. The reproduction signal processing circuit 28 performs a decoding process and an error detection process on the RF signal. When an error is detected, the reproduction signal processing circuit 28 performs an error correction process, and then performs reproduction data via the buffer manager 37 as the reproduction data. Store in the buffer RAM 34.

  The drive control circuit 26 generates a drive signal for the tracking actuator for correcting the displacement of the objective lens in the tracking direction based on the track error signal from the reproduction signal processing circuit 28. Further, the drive control circuit 26 generates a driving signal for the focusing actuator for correcting the focus shift of the objective lens based on the focus error signal from the reproduction signal processing circuit 28. The drive signals for the actuators generated here are output to the optical pickup device 23. Thereby, tracking control and focus control are performed. Furthermore, the drive control circuit 26 generates a drive signal for driving the seek motor 21 and a drive signal for driving the spindle motor 22 based on an instruction from the CPU 40. The drive signal of each motor is output to the seek motor 21 and the spindle motor 22, respectively.

  The buffer RAM 34 temporarily stores data to be recorded on the optical disc 15 (recording data), data reproduced from the optical disc 15 (reproduction data), and the like. Data input / output to / from the buffer RAM 34 is managed by the buffer manager 37.

  The encoder 25 takes out the recording data stored in the buffer RAM 34 through the buffer manager 37 based on an instruction from the CPU 40, modulates the data, adds an error correction code, and the like, and writes a signal to the optical disc 15. Is generated. The write signal generated here is output to the laser control circuit 24.

  The laser control circuit 24 controls the light emission power of the semiconductor laser of the optical pickup device 23. For example, during recording, a laser control circuit 24 generates a semiconductor laser drive signal based on the write signal, recording conditions, semiconductor laser emission characteristics, and the like.

  The interface 38 is a bidirectional communication interface with the main control device 92 via the drive interface 97, and conforms to the same standard interface as the drive interface 97.

  The flash memory 39 stores various programs including a program according to the present invention described by codes decodable by the CPU 40, recording conditions including recording power and recording strategy information, and emission characteristics of the semiconductor laser. Yes.

  The CPU 40 controls the entire optical disc apparatus 20 according to the program stored in the flash memory 39 and saves data necessary for control in the RAM 41 and the buffer RAM 34.

<Recording process of video content>
Next, recording processing of video content (hereinafter, abbreviated as “CSS encrypted content” for convenience) encrypted by the CSS encryption method in the personal computer 10 configured as described above will be described. Here, it is assumed that the CSS encrypted content and its key information are downloaded from the website of the CSS encrypted content provider via the Internet and temporarily stored in the hard disk 94a. Further, it is assumed that the optical disc 15 is set in the optical disc apparatus 20.

(1) When the CPU 92a of the main control device 92 receives a request for writing the CSS encrypted content from the user to the optical disc via the input device 95, the CSS stored in the hard disc 94a is stored in the optical disc device 20. Instructs writing of encrypted content and its key information.

(A) When the CPU 40 of the optical disc device 20 receives a CSS encrypted content and key information write instruction from the main control device 92, the CPU 40 sets the start address of the program corresponding to the flowchart of FIG. The program is set in the program counter of the CPU 40 and processing (hereinafter referred to as “write processing” for convenience) is started. Note that the flowchart of FIG. 11 corresponds to a series of processing algorithms executed by the CPU 40.

(B) In the first step S401, the byte 16 of the physical format information of the set optical disc is extracted. The physical format information is read when the optical disc is set and stored in the RAM 41.

(C) In the next step S403, it is determined whether or not the byte 16 of the extracted physical format information is “01h”. That is, it is determined whether or not the set optical disc is compatible with the recording of CSS encrypted content. Here, since the set optical disk is the optical disk 15, the byte 16 of the extracted physical format information is “01h”, and the determination here is affirmed, and the process proceeds to step S405. That is, it is determined that the set optical disc is compatible with the recording of CSS encrypted content.

(D) In step S405, writing of the CSS encrypted content to the data area is permitted. Thereby, writing of the CSS encrypted content to the data area of the optical disc is started via the encoder 25, the laser control circuit 24, and the optical pickup device 23.

(E) In the next step S407, the write data amount instructed from the main control device 92 is compared with the written data amount to determine whether or not the writing of the CSS encrypted content in the data area is completed. To do. If the writing of the CSS encrypted content to the data area is not completed, the determination here is denied, and it is determined whether or not the writing of the CSS encrypted content to the data area is completed again after a predetermined time has elapsed. To do. On the other hand, if the writing of the CSS encrypted content in the data area has been completed, the determination here is affirmed and the process proceeds to step S409.

(F) In this step S409, writing of the key information of the CSS encrypted content to the lead-in area is permitted. As a result, writing of lead-in information including key information to the lead-in area of the optical disc is started via the encoder 25, the laser control circuit 24, and the optical pickup device 23.

(G) In the next step S411, the main controller 92 is notified that the writing of the CSS encrypted content and its key information has been completed normally. Then, the writing process is terminated.

(H) In step S403, if the extracted byte 16 of the physical format information is not “01h”, the determination in step S403 is denied, and the process proceeds to step S421.

(I) In this step S421, it is determined whether or not the address information of the ADIP unit in the data area is set so that the address decreases from the inner circumference side to the outer circumference side of the disk. That is, it is determined whether or not the physical address of the data area decreases from the inner circumference side to the outer circumference side of the disk. If the physical address of the data area does not decrease from the inner circumference side to the outer circumference side of the disk, the determination here is denied and the process proceeds to step S423.

(J) In step S423, the disc ejection mechanism (not shown) is instructed to eject the set optical disc.

(K) In the next step S425, the main control device 92 is notified to replace the optical disk that supports recording of CSS encrypted content. Then, the writing process is terminated.

(L) On the other hand, if the physical address of the data area decreases from the inner circumference side to the outer circumference side of the disk in step S421, the determination in step S421 is affirmed and the process proceeds to step S427.

(M) In step S427, the main controller 92 is notified that writing of the CSS encrypted content and its key information is abnormally terminated. Then, the writing process is terminated.

(2) Upon receiving “normal end” from the optical disk device 20, the CPU 92a of the main control device 92 instructs the HDD 94 to delete the CSS encrypted content and its key information stored in the hard disk 94a.

(3) The CPU 92a of the main control device 92 displays on the display unit of the display device 96 that the recording of the CSS encrypted content has been normally completed and notifies the user. Then, the optical disk device 20 is instructed to eject the optical disk, and the CSS encrypted content recording process is terminated.

(4) When the CPU 92a of the main control device 92 receives "Disc exchange" from the optical disc device 20, a message is displayed on the display device 96 so as to exchange the optical disc with an optical disc capable of recording CSS encrypted content. To notify the user.

(5) When the CPU 92a of the main control device 92 receives “abnormal end” from the optical disc device 20, the CPU 92a displays a message indicating that the CSS encrypted content could not be recorded on the display unit of the display device 96, Notify the user.

  As is clear from the above description, in the personal computer 10 according to the present embodiment, an optical recording device is realized by the optical disc device 20, and a processing device is realized by the CPU 92a and a program executed by the CPU 92a. A part of the processing device realized by processing according to the program by the CPU 92a may be configured by hardware, or all may be configured by hardware.

  In the optical disc apparatus 20, recording means is realized by the encoder 25, the laser control circuit 24, and the optical pickup device 23, and the first determination means and the second determination are performed by the CPU 40 and a program executed by the CPU 40. Means and discharge means are realized. Note that a part of each means realized by processing according to the program by the CPU 40 may be configured by hardware, or all may be configured by hardware.

  In the writing process in the optical disc apparatus 20, the determination method and the recording method according to the present invention are implemented.

  Further, in the present embodiment, among the plurality of programs recorded in the flash memory 39, the program according to the present invention is included in the program corresponding to the flowchart of FIG.

  As described above, according to the optical disc apparatus 20 according to the present embodiment, it is possible to record only CSS encrypted content on the set optical disc before recording the CSS encrypted content and its key information on the optical disc. Whether or not “content limitation information” (discrimination information) indicating that the content is a valid content is stored. As a result, if “content limitation information” is stored on the optical disc, CSS encryption is performed. The content and its key information are recorded on the optical disc. On the other hand, if “content limited information” is not stored on the optical disc, whether the physical address of the data area decreases from the inner circumference side to the outer circumference side of the disc, that is, the meandering of the track of the optical disc. Is determined to have a meandering portion deviating from the DVD + R standard. As a result, if the meandering of the track of the optical disc does not have a meandering portion deviating from the DVD + R standard, the set optical disc is Discharge. Accordingly, it is possible to record the CSS encrypted content and its key information on the optical disc 15 according to the present invention. As a result, the CSS encrypted content can be recorded on the optical disc 15 according to the present invention for recording in a reproducible state. Therefore, for example, the video content downloaded together with the key information can be recorded on the optical disc 15 in a reproducible state.

  Further, when the optical disc 15 according to the present invention is set in a conventional optical disc apparatus, the meandering of the track has a meandering portion deviating from the DVD + R / RW standard, so that it is immediately ejected. Therefore, only CSS encrypted content can be recorded on the optical disc 15 according to the present invention. That is, the optical disc 15 according to the present invention is a recording optical disc dedicated to CSS encrypted content.

  Further, since the personal computer 10 according to the present embodiment includes the optical disc device 20, it is possible to record the CSS encrypted content and its key information on the optical disc 15 according to the present invention. As a result, the CSS encrypted content can be recorded on the optical disc 15 according to the present invention for recording in a reproducible state.

  In the above embodiment, the case where the physical address is set so as to decrease from the inner circumference side to the outer circumference side of the disk over the entire data area has been described. In this area, the physical address may be set so as to decrease from the inner circumference side to the outer circumference side of the disk.

  That is, it is sufficient that the meandering of the track has at least part of the meandering portion deviating from the DVD + R / RW standard.

  In the above-described embodiment, the address information of the ADIP unit in the data area is addressed from the inner circumference side to the outer circumference side of the disc so that the meandering of the track has a meandering portion that is out of the DVD + R / RW standard. However, the present invention is not limited to this.

  For example, the address information of the ADIP unit in the data area may be set so that the address is partially random, or may be set to include a partially impossible (large) address.

  Further, the meandering of the track may be set to have a meandering portion having a frequency exceeding the frequency defined in the DVD + R / RW standard. Specifically, the meandering of the track may be set to have a meandering portion having a frequency 1.5 times the frequency defined by the DVD + R / RW standard. As a result, the meandering of the track has at least part of the meandering portion that deviates from the DVD + R / RW standard.

  Further, the meandering of the track may be set to have a meandering portion having an amplitude smaller than the amplitude defined in the DVD + R / RW standard. Specifically, the meandering of the track may be set to have a meandering portion having an amplitude that is 1/2 of the amplitude defined by the DVD + R / RW standard. As a result, the meandering of the track has at least part of the meandering portion that deviates from the DVD + R / RW standard.

  Furthermore, the meandering of the track may be set so as to have a meandering portion subjected to phase modulation different from the phase modulation defined in the DVD + R / RW standard. As a result, the meandering of the track has at least part of the meandering portion that deviates from the DVD + R / RW standard.

  Further, the meandering of the track in the data area may be set to have a meandering portion not including the ADIP unit, may be set to have a meandering portion not including the synchronization information portion, or may be set to the ADIP information portion. It may be set to have a meandering portion that does not include. As a result, the meandering of the track has at least part of the meandering portion that deviates from the DVD + R / RW standard.

  In short, it suffices that the meandering of the track has at least a meandering portion deviating from the DVD + R / RW standard. In this case, the determination in step S421 is changed according to the content that is out of the DVD + R / RW standard. Thereby, the effect similar to the said embodiment can be acquired.

  In the above embodiment, the optical recording system is a personal computer. However, the optical recording system may be a DVD recorder that performs the same processing as the CSS encrypted content recording processing.

  As described above, the optical recording medium of the present invention is suitable for recording CSS encrypted content in a reproducible state. The optical recording apparatus and the optical recording system of the present invention are suitable for recording the CSS encrypted content on the optical recording medium of the present invention in a reproducible state. Also, the discrimination method of the present invention is suitable for easily discriminating whether or not the optical recording medium is compatible with CSS encrypted content recording. The recording method of the present invention is suitable for recording the CSS encrypted content on the optical recording medium of the present invention in a reproducible state. Further, the program of the present invention is suitable for causing an optical recording device to record the CSS encrypted content on the optical recording medium of the present invention in a reproducible state.

It is sectional drawing for demonstrating the structure of the optical disk which concerns on one Embodiment of this invention. It is a figure for demonstrating the track | truck in the optical disk of FIG. It is a figure for demonstrating the meandering of the track | truck in the optical disk of FIG. It is a figure for demonstrating an information frame. 5A and 5B are waveform diagrams for explaining the meandering shape of the ADIP information section. 6A and 6B are waveform diagrams for explaining the meandering shape of the synchronization information section. It is a figure for demonstrating an ADIP word. It is a figure for demonstrating physical format information. It is a block diagram which shows the structure of the personal computer as an optical recording system which concerns on one Embodiment of this invention. It is a block diagram which shows the structure of the optical disk apparatus in FIG. 11 is a flowchart for explaining the operation of the optical disc apparatus of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Personal computer (optical recording system), 15 ... Optical disk (optical recording medium), 20 ... Optical disk apparatus (optical recording apparatus), 23 ... Optical pick-up apparatus (part of recording means), 24 ... Laser control circuit (recording means) Part), 25 ... Encoder (part of recording means), 40 ... CPU (first judgment means, second judgment means, discharge means), 92 ... Main control device (processing device).

Claims (12)

In a recording optical recording medium in which a spiral or concentric track is formed and has a recording area including a management information area and a data area,
The key information of the content encrypted by the CSS encryption method can be recorded in the management information area, and the content recordable in the data area is only the content encrypted by the CSS encryption method. An optical recording medium.   2. The optical recording medium according to claim 1, wherein discrimination information indicating that content that can be recorded in the data area is only content encrypted by a CSS encryption method is recorded in advance. The track meanders,
The optical recording medium according to claim 2, wherein the discrimination information is included in information on a meandering shape of the track.   4. The optical recording medium according to claim 3, wherein the meandering of the track has at least part of a meandering portion having a frequency exceeding a frequency defined by a DVD + R or DVD + RW standard.   4. The optical recording medium according to claim 3, wherein the meandering of the track has at least part of a meandering portion having an amplitude smaller than the amplitude defined in the DVD + R or DVD + RW standard.   4. The optical recording medium according to claim 3, wherein the meandering of the track has at least part of a meandering portion subjected to phase modulation different from the phase modulation defined in the DVD + R or DVD + RW standard.   4. The optical recording medium according to claim 3, wherein the meandering of the track has at least part of a meandering portion including address information different from the address information defined by the DVD + R or DVD + RW standard. An optical recording apparatus having the optical recording medium according to any one of claims 1 to 7 as a target medium,
First determination means for determining whether or not determination information indicating that the recordable content is only content encrypted by the CSS encryption method is recorded on the optical recording medium;
When the determination information is recorded on the optical recording medium as a result of the determination by the first determination means, the content encrypted by the CSS encryption method and its key information are stored in the data area of the optical recording medium. Recording means for recording each in the management information area;
As a result of the determination by the first determination means, when the determination information is not recorded on the optical recording medium, the meandering of the track of the optical recording medium has a meandering portion deviating from the DVD + R or DVD + RW standard. Second judging means for judging whether or not;
Discharging means for discharging the optical recording medium when the meandering of the track of the optical recording medium does not have a meandering portion deviating from the DVD + R or DVD + RW standard as a result of the determination by the second determining means; An optical recording apparatus provided. An optical recording system having the optical recording medium according to any one of claims 1 to 7 as a target medium,
An optical recording apparatus according to claim 8;
An optical recording system comprising: a content encrypted by a CSS encryption method via the optical recording device; and a processing device for recording the key information in a data area and a management information area of the optical recording medium. A discriminating method for discriminating whether or not an optical recording medium supports recording of content encrypted by a CSS encryption method,
Checking whether or not discrimination information indicating that only content encrypted by the CSS encryption method is recordable content is stored in the optical recording medium;
As a result of the check, when the determination information is stored in the optical recording medium, determining that the optical recording medium is compatible with recording of content encrypted by a CSS encryption method; Including determination method. A recording method for recording content encrypted by a CSS encryption method and its key information on an optical recording medium,
Checking whether or not discrimination information indicating that only content encrypted by the CSS encryption method is recordable content is stored in the optical recording medium;
As a result of the check, when the discrimination information is stored in the optical recording medium, the content encrypted by the CSS encryption method and its key information are recorded in the data area and the management information area of the optical recording medium, respectively. A process of performing;
As a result of the check, when the discrimination information is not stored in the optical recording medium, it is determined whether or not the meandering of the track of the optical recording medium has a meandering portion that deviates from the DVD + R or DVD + RW standard. When;
A step of ejecting the optical recording medium when the meandering of the track of the optical recording medium does not have a meandering portion deviating from the DVD + R or DVD + RW standard as a result of the determination. A program for use in an optical recording apparatus having the optical recording medium according to any one of claims 1 to 7 as a target medium,
A procedure for checking whether or not discrimination information indicating that only content encrypted by the CSS encryption method is recordable is stored in the optical recording medium;
As a result of the check, when the discrimination information is stored in the optical recording medium, the content encrypted by the CSS encryption method and its key information are recorded in the data area and the management information area of the optical recording medium, respectively. And the procedure to do;
As a result of the check, when the discrimination information is not stored in the optical recording medium, it is determined whether or not the meandering of the track of the optical recording medium has a meandering portion that deviates from the DVD + R or DVD + RW standard. When;
A step of ejecting the optical recording medium when the meandering of the track of the optical recording medium does not have a meandering portion deviating from the DVD + R or DVD + RW standard, as a result of the determination; A program to be executed.

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